Drawbar shift for tractors



April 3, 192s. u 1,665,133

V. L. GIBSON DRAWBAR SHIFT FOR TRACTORS Filed March 8, 1927 2Sheets-Sheet 1 27,0.1 r 7. .a f fg-3i 3 i Q" o n n if e 8 21 ATTORNEYApril 3, 11428.k

v. L. GIBSON DRAWBAR SHIFT FOR TRACTORS Filed March 8, 1927 2Shets-Sheet 2 INVENTOR VL. ibSO-ro BY m WITNESSES 77? Fw-lf ATTORNEYPatented Apr. 3, 1928.

iseaisa -VIRGIL L. GIBSON, 0F SALEM, OREGON.

DRAWBAR SHIFT non iRAcTons.

'- Applcatonuled March `8, 1927.," Serial No. 173,745.

"This 'invention relates to a drawy bar shift for tractors.

` VAnobj ect of the invention is the provision of a device 'for easyandreadyy manipulation of V the'draw bar of the 'tractor'at any timeparticularly while' the tractor is in 'motion andundenfnllfload."

"'A further "object of the 'inventionis the pov'isionbf a swinging drawbar which'is adapted Y'to be manually "shifted particularlywhenthetrctoris plowing on" a hillside and turningthe furrow down thehill.

yAt this time the y'tractor and plow 'are both inclined' to workdownthehill and the plow doesnot vprovide la'sufhcient 'depthA of cut..

l/Vhenthe end of the field is reached itis necessary' to turn thetractor so that the furrowv is thrown up the hill whereby the plowwillnotfcut too deeply. "In shifting the swinging draw bar ofmy improveddevice I'am able to overcome this difficulty by shifting the draw bar ata predetermined angle tothe longitudinal Va'Xisof the tractor andmaintaining the angular shift'.

This inventionnwillA be "best 'understood from a considerationfof thefollowing detailed description, in view/of the accompanying drawingsforming a partof 'the specifi cation; nevertheless it is to be"understood that the invention is not confined to the disclosure, beingsusceptible of vsuch changes andl modilications which shall 'define nomaterial departure from the salient' features of the invention asexpressed'in the appended claims'. i f Y In the drawings: t Figure 1 isa side'view in'elevation of `a tractor equipped withv the swinging drawbar and showing the means for operating the same, y

AFigure 2 is a horizontal sectiony taken along thevline 2-2 of Figure 1,

Y and alfront axle 13.

Figure 3 is Va ,transverse vertical section taken along the liney 3-3 ofFig/ure 1,l p

Figure i is a fragmentary planY view of the rear end4 of the tractor,

Figure 5 is a view in perspective showing the rear end of ay tractor andthe operating means for shifting the draw bar, and

Figure 6 is a view in perspective showing the parts of the draw barshifting device in detachedfrelation. u u Referring more particularly tothe drawingsl() designates generally a tractor having a rear axlehousing 11, a crank casel 12 i Ay draw ba'r'lll is pivotally mountedatfits,`

inner end on'a' bolt 15' carried by Ithe end of an ar1n`16 in a bracketk'17 vbolted'tothe' inner end Vofthev arm 16.' ,A U-shaped bracket 18 isrigidly secured to the inner end ,of the arim ldand'to itsupper face andisconnectedby means fo'f a radius rod bolt 19 which Vis cars ried by:apair of'ea'rs 20j' depending froirn the lower face of the crank case12'. The out-V` er'endof'the bar 16 is bolted, as at 21, to the frontendofthe tractor framel and" on't'he front axle'bolt. 'f '1* The free endof the draw ybar 14: has'an eye 22 pivotally connected thereto', asshownat 23.' v'ihis'free endy oftheV arrn is located betweenthe'arms 24 oftheUshaped cross head 25. This cross head` is provided with passages 26 toreceive thezreduced ends 27' of a sleeve 28." The sleeve iniconjunctionwith the reduced end 27 provides shoulders 29 which are adapted to abutthevisnner faces ofthe arms24 ofthe crojssvhead; The re ducedportionsare provided with diametri--` cally Ldisposed. lugs 30 receivedlby notches 'luformed in thearms 24 andL opening into the passages 26.yThe co-operationof the lugs with the notchesA prevent rotation of thesleeve. Said sleevevis internally threaded, as shown at 32, for aypurpose which will be' presently described;v A' pair of lbrackets arebolted to the dierentialj'caSing34jby meansjof 'the usualJ bolts `whichsecure the rear axlehousings 11 to thedifferential casing.' The outerends'of the brackets are provided with bearings' 36 which' receive'asleeve 37 and set screws 38' carried `bythe bearings secure the sleevevagainst rotation. A shaft 39 is rotatably mounted inthe sleeve"37 andhas yahand wheel Ll0 to provide for manual rotation lof theshaft.' Asprocket wheel 41 is rigid withanend'of the shaft over which is traineda chain 42' adapted to drive thel sprocket 43 rigid with one end ofascrewt. u At the upper end of depending brackets 45 are formed bearings46 which are secured by set screws 4-7 to the sleeve-37. iThe low?. erends of these bracketsare'provided with horizontal lextensions-i8 towhich are Asecured bearings 49 formed off` strap iron. "kboltf'O securesthe bearingt)` to' net VVonly the horif` ZontaleXtension iSibnt to' an'inwardly -eX- tending flange 51. of the`U-shaped bracket 52.y This'bracketis disposed inwardly 'of the cross head 25 since thebearings 49pro;

ject outwardlyof the bracket'where 'they re-' mounted on a tractor, abracket supported by the tractor, bearings carried by the bracket andoffset from said bracket, a screw mounted in the bearings, means forcausing rotation of the screw, and a U-shaped cross head carried by thescrew and receiving and guiding the free end of the draw bar, said crosshead adapted to be moved laterally of the longitudinal axis of thetractor for shifting the free end of the draw bar, an internallythreaded sleeve secured to the arms of the U-shaped cross head andengaging the threads of the screw, said cross head being provided Withslots, and Wings projecting from the sleeve and received byy the slotsin the cross head to prevent rotation of the sleeve.

VIRGIL L. GIBSON.

